Walter j



- (No Model.)

W. J. DREW.

CARPET SWEEPER.

No. 422,508. Patented'Mar. 4, 1890.

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UNITED STATES PATENT OFFIC WALTER J. DREW, OF GRAND RAPIDs, MICHIGAN,AssIeNoR TO THE BISSELL CARPET sWEEPER COMPANY, OF SAMEPLAOE.

CARP'ET-SWEEPER.

SPECIFICATION forming part of Letters Iatent No. 422,508, dated March 4,1890. Application filed July 8, 1889. Serial No. 316,770. (No model.)

To all whom it may concern:

Be it known that I,WVALTER .I. DREW, a citizen of the UnitedStates,residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented new and useful Improvements in Carpet-Sweepers,of which the following is a specification.

This invention relates to that type of carpet-sweepers which areprovided with rotary brush-carrying shafts adapted to automaticallyadjust themselves to the surface traversed independent of any verticalmovement of the sweeper-case.

The object of the present invention is to improve the priorconstructions and provide novel, simple, and economical means formaintaining a brush-shaft within a carpet-sweeper casing whilepermitting such shaft to gravitate and place the brush in contact withthe floor, whereby the brush is self adjusting to the surface traversedand can rise and fall independent of any vertical movement of thesweeper-=case and of any movement of the pivots-or pintles whichmaintain the brushshaft in the case. A

The object of the invention I accomplish by the features of constructionand combination of devices hereinafter 'described and claimed, referencebeing made to the accompanying drawings, in which Figure 1 is an endelevation of sufficient of a carpet-sweeper to illustrate my invention,and Fig. 2 is a longitudinal sectional view taken centrally through thebrush-shaft.

In order to enable those skilled in the art to make and use myinvention, I will now describe the same in detail, referring to thedrawings, wherein- The numeral 1 indicates a sweeper=case having its endwalls provided with vertical slots 2, for the rising and falling motionsof a brush shaft 3, having attached frictionwheels 4, revolved byfrictional contact with the drive-Wheels 5. The handle-carrying bail Gis pivoted to the sweeper-case in any manmer suitable for the conditionsrequired. The

brush shaft is provided at each end with an enlarged circular recess 7,that constitutes a bearing for a non rotarypintle 8, which Is of adiameter'considerably less than the diameter of the circular bearing, insuch manner that when the pintles are in the bearings the brush shaftcan freely rise and fall to conform itself to the surface traversed independent of any movement of the pintles, which latter, as regards rotaryor vertical movements, are stationary or immovable.

The diameter of the circular bearing for a pintle is preferably abouttwice the diameter (or more) of the pintle, in order to permit asufficiently wide range of vertical movement of the brush-shaft.

The sweeper-case is provided at each end with a transverse elastic band9, and the pin tles are immovably fixed on the bands for the purpose ofdetaching the brush by springing the middle portion of one of theelastic bands laterally away from the end of the case to remove a pintlefrom an enlarged circular bearing in the brush-shaft; but I do notconfine myself to the pintles on the spring bands, as such pintles canbe otherwise fixed or im movably held and supported against rotarymovement, so that the brush-shaft can freely rise and fall independentof any movement of the pintles and independent of any verti= calmovement of the sweeper-case.

I can employ my invention in connect-ion with sweeper-casings and drivemechanisms of any known type, and by the simple contrivances shown anddescribed the brush is made self-adjusting in a very economical manner,whereby a desirable sweeper can be manufactured at comparatively smalleX- pense.

I do not confine myself to a non rotary pin tle and enlarged circularbearing at each end of the brush-shaft.

Having thus described my invention, what I claim is-= ,.1. Incombination with a carpet sweeper having a non-rotary pintle, aselfadjusting brush shaft having a rigidly-attached pulley looselymounted on the pintle and rising and falling with the brush shaftindependent of any movement of such pintle and of any vertical movementof the sweeper-case, substantially as described.

2. In a carpet sweeper, the combination, witha sweepei=case, of aSelfadjusting brush r, t M u A 1 a" v shaft having an enlarged circularbearing, a In testimony whereof I have affixed my non-rotary pintlc of adiameter less than the signature in presence of two Witnesses. bearingwhich permits the brush-shaft to rise 1 y and fall independent of anymovement of the VAIH ER DREW 5 pintle to adjust itself automatically tothe \Vitnesses:

surface traversed, and means for operating ARTHUR C. DENISON, thebrush-shaft,substantially as described. CHAS. B. J UDD.

